/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffect.h
Update set-by-caller magnitudes for the active effect to match the new values, if possible; Replaces existing values
void UpdateActiveGameplayEffectSetByCallerMagnitudes ( [FActiveGameplayEffectHandle](API\Plugins\GameplayAbilities\FActiveGameplayEffectHandle) ActiveHandle, const [TMap](API\Runtime\Core\Containers\TMap)< [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag), float > & NewSetByCallerValues )